Sectional die



P. P. ARNOLD.

SEGTIONAL DIE.

No. 541,306. Patented June 18, 1895.

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UNITED STATES PATENT Orricn.

FRANCIS P. ARNOLD, OF PEMBROKE, ASSIGNOR TO THE J. G. PHINNEY COUNTERCOMPANY, OF STOUGHTON, MASSACHUSETTS.

SECTIONAL DIE.

SPECIFICATION forming part of Letters Patent No. 541,306, dated June 18,1895.

Application filed September 6, 1394- Serial No. 522,271. (Model) To allwhom it may concern:

Be it known that I, FRANCIS P. ARNOLD, a citizen of the United States,residing at Pembroke, in the county of Plymouth and State oflilassachusettshave. invented certain new and useful Improvements inSectional Dies; and I do hereby declare the following to be a full,clear, and exact description of themvention, such as will enable othersskilled in the art to which it appertains to make and use the same,reference being had to the accompanying drawings, and to figures ofreference marked thereon, which form a part of this specification.

This invention relates to improvements in punches, particularly thatclass employed for producing a scalloped or serrated edge after themanner of work accomplished by pinkiug llOllS.

My invention is embodied in a sectional punch or one composed of anumber of similar parts rigidly'fastened together as a unit.

The gist of my invention is embodied in the peculiar construction of theseveral parts which compose the punch, whereby not only a continuousangular or serrated cutting edge is produced but proper clearance forthe tool is obtained while the cutting edge can be easily sharpened.These several and notable features will be hereinafter fully describedand explained.

The drawings represent, in Figure 1, a plan of a sectional punchembodying my invention, the broken parallel lines indicating divisionallines of separate sections. Fig. 2 is a side elevation of a section.Fig. 3 is a central section longitudinally of ,one of the blanks. Fig. 4is a perspective View of a blank.

Hitherto it has been a difiicult matter to produce a punch in a simplemanner at a small cost, which shall have an angular, serrated orscalloped cutting edge.

The object of my invention is to produce a punch which shall be capableof cutting metal,

leather or other articles without the aid of a die to co-operate withit, and shall be moreover easily sharpened and adapted to perform theduties of a pinking iron, and further one which may be enlarged orreduced in size as circumstances require. In the present instance thispunch is particularly designed for side 8.

tinting the edge of heel rands, which are formed from straight piecesand subsequently pressed into shape. However as this punch is to be madeof steel it is equally adapted for cutting metal, paper or cloth, thefacility with which it can be sharpened and the good clearance spacesprovided allowing any substance to be operated upon with success.

For purposes of description I shall designate the side of the punch withthe numeral 2-, as the front; the rear side at 3 and further state thatthe several sections or blanks are to be held in a vertical position, asin Fig. 2, which enables the cutting edge to be pressed ,upon thematerial in process, and which lat- .lengths of steel, rectangular incross-section.

Furthermore the rectangle is an oblong one, the long sides 5, 5, beingcontiguous, when the several sections are united which is commonly donewith a bolt 6, adapted to pass through a transverse opening 7 one ineach blank. These openings are elongated to provide for adjustment ofthe several sections and thus allow long or short pieces to-be employed,their lengths varying according to their time of service. The shortsides are indicated at- 8, 8', and these, when the several sections aregrouped together, conjointly form the front and rear surface 2, 3 of thepunch.

In order to create the cutting edge shown by the heavy black line at 9in Fig. 1, the front side of each section is formed with an enteringangle or bay 10, one half of which appears in elevation in Fig. 3. Thisbay taken in plan, as shown in Fig. 1, is a V shaped opening having sidewalls 12, 12 and with the apex extending almost to the rear The smallamount of material thus left is intended for the bevel l3, and thusproduces a chisel edge for the two cutting blades with which eachsection is provided. If these sections withoutfurther change in theirshape are now united, it will be seen that they form a continuous seriesof entering angles, the serrations depending upon the degree of angle ofthe several bays which are all located upon the front side of the punch;but serrated cutting edge, substantially as and for to provide forclearance and in order to create a cutting edge the corresponding lowercorners of the sections are removed in order to create two oppositesloping plane surfacesl, 14 which in connection with the co-operatingwalls 12, 12', respectively produce a thin knife-like blade. It will benoticed that two of these oblique surfaces conjointly serve, when twosections are united, to create a rear entering angle or bay 10', andsuch is produced by an oblique surface 1i on one section co-operatingwith a similar meeting surface l t on the next adjacent section. As aresult similar angles or bays occur oppositely in the punch; one, thefront l0, being created in the substance of the materialwhich coinposesa section, while the opposite angle or bay 10 is formed by the adjacentmeeting surfaces on two contiguous sections. Thus the cutting edge is acontinuous or uninterrupted series of straight bladesangularlypositioned and formed by similar, but oppositely inclinedentering angles which are alternately arranged along the back and frontsides of the punch.

In Fig. 1, the face of the punch shows that the central section difierssomewhat from the adjacent side section, the entering angles beingwider. This particular punch as before stated is intended for cuttingthe edge of heel rands and because the greatest iiexure of the sameoccurs at the middle, so more material must be removed to permit a fiatbend. Ordinarily however the entire cutting edge of the punch is ofuniform shape.

What I claim is 1. As a new article of manufacture, a punch purposesexplained.

2. A punch composed of a series of blanks adapted for use in multiple,each blank cornprising a rectangular blank having a V shaped cuttingblade, said blade being created by an entering angle on one side of theblank, conjointly with two slopingsurfaces oppositely on the other sideof the blank, substantially as stated and set forth.

3. A sectional punch composed of two or more blanks rectangular in crosssection, each blank comprising two straight blades angularly disposedand forming when combined a continuous cutting edge, said edge beingcreated by a series of entering angles alternately arranged andoppositely on two sides of the punch, substantially as described.

4. In combination two or more rectangular blanks or sections,-and meansforjoining them as a unit to form a punch, each blank consisting ofblades angularly disposed, said blades being produced by two oppositeentering angles, one angle created by removal of material in one side ofthe blank,the other angle by removal of material from two adjaangularblank, each blank containing an eutering angle on one side and twosloping surfaces oppositely and exteriorly on the corresponding side,each of said sloping surfaces producing conjointly with the similarsurfaces on the next adjacent blanks, oppositely disposed enteringangles to create a continuous serrated cutting edge upon the end of theblank, substantially as explained.

In testimony whereof I aflix my signature in presence of two witnesses.

FRANCIS P. ARNOLD. \Vitnesses:

H. E. LODGE, FRANCIS O. STANwooD.

